forked from wireshark/wireshark
-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathcapture_sync.c
2213 lines (1956 loc) · 75.6 KB
/
capture_sync.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* capture_sync.c
* Synchronisation between Wireshark capture parent and child instances
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#define WS_LOG_DOMAIN LOG_DOMAIN_CAPTURE
#include <wireshark.h>
#ifdef HAVE_LIBPCAP
#include <glib.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <wsutil/strtoi.h>
#include <wsutil/ws_assert.h>
#ifdef _WIN32
#include <wsutil/unicode-utils.h>
#include <wsutil/win32-utils.h>
#include <wsutil/ws_pipe.h>
#else
#include <glib-unix.h>
#endif
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#include "capture/capture-pcap-util.h"
#ifndef _WIN32
/*
* Define various POSIX macros (and, in the case of WCOREDUMP, non-POSIX
* macros) on UNIX systems that don't have them.
*/
#ifndef WIFEXITED
# define WIFEXITED(status) (((status) & 0177) == 0)
#endif
#ifndef WIFSTOPPED
# define WIFSTOPPED(status) (((status) & 0177) == 0177)
#endif
#ifndef WIFSIGNALED
# define WIFSIGNALED(status) (!WIFSTOPPED(status) && !WIFEXITED(status))
#endif
#ifndef WEXITSTATUS
# define WEXITSTATUS(status) ((status) >> 8)
#endif
#ifndef WTERMSIG
# define WTERMSIG(status) ((status) & 0177)
#endif
#ifndef WCOREDUMP
# define WCOREDUMP(status) ((status) & 0200)
#endif
#ifndef WSTOPSIG
# define WSTOPSIG(status) ((status) >> 8)
#endif
#endif /* _WIN32 */
#include <epan/packet.h>
#include <epan/prefs.h>
#include "file.h"
#include "ui/capture.h"
#include <capture/capture_sync.h>
#include "sync_pipe.h"
#ifdef _WIN32
#include "capture/capture-wpcap.h"
#endif
#include "ui/ws_ui_util.h"
#include <wsutil/filesystem.h>
#include <wsutil/file_util.h>
#include <wsutil/report_message.h>
#include "extcap.h"
#ifdef _WIN32
#include <process.h> /* For spawning child process */
#endif
#include <wsutil/ws_pipe.h>
#ifdef _WIN32
static int create_dummy_signal_pipe(char **msg);
static HANDLE dummy_signal_pipe; /* Dummy named pipe which lets the child check for a dropped connection */
static char *dummy_control_id;
#else
static const char *sync_pipe_signame(int);
#endif
static gboolean sync_pipe_input_cb(GIOChannel *pipe_io, capture_session *cap_session);
static int sync_pipe_wait_for_child(ws_process_id fork_child, char **msgp);
static void pipe_convert_header(const unsigned char *header, int header_len, char *indicator, int *block_len);
static ssize_t pipe_read_block(GIOChannel *pipe_io, char *indicator, int len, char *msg,
char **err_msg);
static void (*fetch_dumpcap_pid)(ws_process_id) = NULL;
static void free_argv(char** argv, int argc)
{
int i;
for (i = 0; i < argc; i++)
g_free(argv[i]);
g_free(argv);
}
void
capture_session_init(capture_session *cap_session, capture_file *cf,
new_file_fn new_file, new_packets_fn new_packets,
drops_fn drops, error_fn error,
cfilter_error_fn cfilter_error, closed_fn closed)
{
cap_session->cf = cf;
cap_session->fork_child = WS_INVALID_PID; /* invalid process handle */
cap_session->pipe_input_id = 0;
#ifdef _WIN32
cap_session->signal_pipe_write_fd = -1;
#endif
cap_session->state = CAPTURE_STOPPED;
#ifndef _WIN32
cap_session->owner = getuid();
cap_session->group = getgid();
#endif
cap_session->count = 0;
cap_session->count_pending = 0;
cap_session->session_will_restart = false;
cap_session->new_file = new_file;
cap_session->new_packets = new_packets;
cap_session->drops = drops;
cap_session->error = error;
cap_session->cfilter_error = cfilter_error;
cap_session->closed = closed;
cap_session->frame_cksum = NULL;
}
void capture_process_finished(capture_session *cap_session)
{
capture_options *capture_opts = cap_session->capture_opts;
interface_options *interface_opts;
GString *message;
unsigned i;
if (!extcap_session_stop(cap_session)) {
/* Atleast one extcap process did not fully finish yet, wait for it */
return;
}
if (cap_session->fork_child != WS_INVALID_PID) {
if (capture_opts->stop_after_extcaps) {
/* User has requested capture stop and all extcaps are gone now */
capture_opts->stop_after_extcaps = false;
sync_pipe_stop(cap_session);
}
/* Wait for child process to end, session is not closed yet */
return;
}
/* Construct message and close session */
message = g_string_new(capture_opts->closed_msg);
for (i = 0; i < capture_opts->ifaces->len; i++) {
interface_opts = &g_array_index(capture_opts->ifaces, interface_options, i);
if (interface_opts->if_type != IF_EXTCAP) {
continue;
}
if ((interface_opts->extcap_stderr != NULL) &&
(interface_opts->extcap_stderr->len > 0)) {
if (message->len > 0) {
g_string_append(message, "\n");
}
g_string_append(message, "Error from extcap pipe: ");
g_string_append(message, interface_opts->extcap_stderr->str);
}
}
cap_session->closed(cap_session, message->str);
g_string_free(message, true);
g_free(capture_opts->closed_msg);
capture_opts->closed_msg = NULL;
capture_opts->stop_after_extcaps = false;
}
/* Append an arg (realloc) to an argc/argv array */
/* (add a string pointer to a NULL-terminated array of string pointers) */
static char **
sync_pipe_add_arg(char **args, int *argc, const char *arg)
{
/* Grow the array; "*argc" currently contains the number of string
pointers, *not* counting the NULL pointer at the end, so we have
to add 2 in order to get the new size of the array, including the
new pointer and the terminating NULL pointer. */
args = (char **)g_realloc( (void *) args, (*argc + 2) * sizeof (char *));
/* Stuff the pointer into the penultimate element of the array, which
is the one at the index specified by "*argc". */
args[*argc] = g_strdup(arg);
/* Now bump the count. */
(*argc)++;
/* We overwrite the NULL pointer; put it back right after the
element we added. */
args[*argc] = NULL;
return args;
}
/* Initialize an argument list and add dumpcap to it. */
static char **
init_pipe_args(int *argc) {
char *exename;
char **argv;
/* Find the absolute path of the dumpcap executable. */
exename = get_executable_path("dumpcap");
if (exename == NULL) {
return NULL;
}
/* Allocate the string pointer array with enough space for the
terminating NULL pointer. */
*argc = 0;
argv = (char **)g_malloc(sizeof (char *));
*argv = NULL;
/* Make that the first argument in the argument list (argv[0]). */
argv = sync_pipe_add_arg(argv, argc, exename);
/* sync_pipe_add_arg strdupes exename, so we should free our copy */
g_free(exename);
return argv;
}
static gboolean
pipe_io_cb(GIOChannel *pipe_io, GIOCondition condition _U_, void * user_data)
{
capture_session *cap_session = (capture_session *)user_data;
if (!sync_pipe_input_cb(pipe_io, cap_session)) {
cap_session->pipe_input_id = 0;
return G_SOURCE_REMOVE;
}
return G_SOURCE_CONTINUE;
}
/*
* Open two pipes to dumpcap with the supplied arguments, one for its
* standard output and one for its standard error.
*
* On success, *msg is unchanged and 0 is returned; data_read_fd,
* message_read_fd, and fork_child point to the standard output pipe's
* file descriptor, the standard error pipe's file descriptor, and
* the child's PID/handle, respectively.
*
* On failure, *msg points to an error message for the failure, and -1 is
* returned, in which case *msg must be freed with g_free().
*/
/* XXX - assumes PIPE_BUF_SIZE > SP_MAX_MSG_LEN */
#define ARGV_NUMBER_LEN 24
#define PIPE_BUF_SIZE 5120
static int
#ifdef _WIN32
sync_pipe_open_command(char* const argv[], int *data_read_fd,
GIOChannel **message_read_io, int *signal_write_fd,
ws_process_id *fork_child, GArray *ifaces,
char **msg, void(*update_cb)(void))
#else
sync_pipe_open_command(char* const argv[], int *data_read_fd,
GIOChannel **message_read_io, int *signal_write_fd _U_,
ws_process_id *fork_child, GArray *ifaces _U_,
char **msg, void(*update_cb)(void))
#endif
{
enum PIPES { PIPE_READ, PIPE_WRITE }; /* Constants 0 and 1 for PIPE_READ and PIPE_WRITE */
int message_read_fd = -1;
#ifdef _WIN32
HANDLE sync_pipe[2]; /* pipe used to send messages from child to parent */
HANDLE data_pipe[2]; /* pipe used to send data from child to parent */
int signal_pipe_write_fd = -1;
HANDLE signal_pipe; /* named pipe used to send messages from parent to child (currently only stop) */
char control_id[ARGV_NUMBER_LEN];
char *signal_pipe_name;
size_t i_handles = 0;
HANDLE *handles;
GString *args = g_string_sized_new(200);
char *quoted_arg;
SECURITY_ATTRIBUTES sa;
STARTUPINFO si;
PROCESS_INFORMATION pi;
int i;
unsigned j;
interface_options *interface_opts;
#else
int sync_pipe[2]; /* pipe used to send messages from child to parent */
int data_pipe[2]; /* pipe used to send data from child to parent */
#endif
*fork_child = WS_INVALID_PID;
if (data_read_fd != NULL) {
*data_read_fd = -1;
}
*message_read_io = NULL;
ws_debug("sync_pipe_open_command");
if (!msg) {
/* We can't return anything */
#ifdef _WIN32
g_string_free(args, true);
#endif
return -1;
}
#ifdef _WIN32
/* init SECURITY_ATTRIBUTES */
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.bInheritHandle = false;
sa.lpSecurityDescriptor = NULL;
/* Create a pipe for the child process to send us messages */
/* (increase this value if you have trouble while fast capture file switches) */
if (! CreatePipe(&sync_pipe[PIPE_READ], &sync_pipe[PIPE_WRITE], &sa, PIPE_BUF_SIZE)) {
/* Couldn't create the message pipe between parent and child. */
*msg = ws_strdup_printf("Couldn't create sync pipe: %s",
win32strerror(GetLastError()));
return -1;
}
/*
* Associate a C run-time file handle with the Windows HANDLE for the
* read side of the message pipe.
*
* (See http://www.flounder.com/handles.htm for information on various
* types of file handle in C/C++ on Windows.)
*/
message_read_fd = _open_osfhandle( (intptr_t) sync_pipe[PIPE_READ], _O_BINARY);
if (message_read_fd == -1) {
*msg = ws_strdup_printf("Couldn't get C file handle for message read pipe: %s", g_strerror(errno));
CloseHandle(sync_pipe[PIPE_READ]);
CloseHandle(sync_pipe[PIPE_WRITE]);
return -1;
}
if (data_read_fd != NULL) {
/* Create a pipe for the child process to send us data */
/* (increase this value if you have trouble while fast capture file switches) */
if (! CreatePipe(&data_pipe[PIPE_READ], &data_pipe[PIPE_WRITE], &sa, PIPE_BUF_SIZE)) {
/* Couldn't create the message pipe between parent and child. */
*msg = ws_strdup_printf("Couldn't create data pipe: %s",
win32strerror(GetLastError()));
ws_close(message_read_fd); /* Should close sync_pipe[PIPE_READ] */
CloseHandle(sync_pipe[PIPE_WRITE]);
return -1;
}
/*
* Associate a C run-time file handle with the Windows HANDLE for the
* read side of the data pipe.
*
* (See http://www.flounder.com/handles.htm for information on various
* types of file handle in C/C++ on Windows.)
*/
*data_read_fd = _open_osfhandle( (intptr_t) data_pipe[PIPE_READ], _O_BINARY);
if (*data_read_fd == -1) {
*msg = ws_strdup_printf("Couldn't get C file handle for data read pipe: %s", g_strerror(errno));
CloseHandle(data_pipe[PIPE_READ]);
CloseHandle(data_pipe[PIPE_WRITE]);
ws_close(message_read_fd); /* Should close sync_pipe[PIPE_READ] */
CloseHandle(sync_pipe[PIPE_WRITE]);
return -1;
}
}
if (signal_write_fd != NULL) {
/* Create the signal pipe */
snprintf(control_id, ARGV_NUMBER_LEN, "%ld", GetCurrentProcessId());
signal_pipe_name = ws_strdup_printf(SIGNAL_PIPE_FORMAT, control_id);
signal_pipe = CreateNamedPipe(utf_8to16(signal_pipe_name),
PIPE_ACCESS_OUTBOUND, PIPE_TYPE_BYTE, 1, 65535, 65535, 0, NULL);
g_free(signal_pipe_name);
if (signal_pipe == INVALID_HANDLE_VALUE) {
/* Couldn't create the signal pipe between parent and child. */
*msg = ws_strdup_printf("Couldn't create signal pipe: %s",
win32strerror(GetLastError()));
ws_close(message_read_fd); /* Should close sync_pipe[PIPE_READ] */
CloseHandle(sync_pipe[PIPE_WRITE]);
return -1;
}
/*
* Associate a C run-time file handle with the Windows HANDLE for the
* read side of the message pipe.
*
* (See http://www.flounder.com/handles.htm for information on various
* types of file handle in C/C++ on Windows.)
*/
signal_pipe_write_fd = _open_osfhandle( (intptr_t) signal_pipe, _O_BINARY);
if (signal_pipe_write_fd == -1) {
/* Couldn't create the pipe between parent and child. */
*msg = ws_strdup_printf("Couldn't get C file handle for sync pipe: %s", g_strerror(errno));
ws_close(message_read_fd); /* Should close sync_pipe[PIPE_READ] */
CloseHandle(sync_pipe[PIPE_WRITE]);
CloseHandle(signal_pipe);
return -1;
}
}
/* init STARTUPINFO & PROCESS_INFORMATION */
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
memset(&pi, 0, sizeof(pi));
#ifdef DEBUG_CHILD
si.dwFlags = STARTF_USESHOWWINDOW;
si.wShowWindow = SW_SHOW;
#else
si.dwFlags = STARTF_USESTDHANDLES|STARTF_USESHOWWINDOW;
si.wShowWindow = SW_HIDE; /* this hides the console window */
if (data_read_fd == NULL) {
si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
} else {
si.hStdInput = NULL; /* handle for named pipe*/
si.hStdOutput = data_pipe[PIPE_WRITE];
}
si.hStdError = sync_pipe[PIPE_WRITE];
#endif
if (ifaces) {
for (j = 0; j < ifaces->len; j++) {
interface_opts = &g_array_index(ifaces, interface_options, j);
if (interface_opts->extcap_fifo != NULL) {
i_handles++;
}
}
}
handles = g_new(HANDLE, 3 + i_handles);
i_handles = 0;
if (si.hStdInput) {
handles[i_handles++] = si.hStdInput;
}
if (si.hStdOutput && (si.hStdOutput != si.hStdInput)) {
handles[i_handles++] = si.hStdOutput;
}
handles[i_handles++] = si.hStdError;
if (ifaces) {
for (j = 0; j < ifaces->len; j++) {
interface_opts = &g_array_index(ifaces, interface_options, j);
if (interface_opts->extcap_fifo != NULL) {
handles[i_handles++] = interface_opts->extcap_pipe_h;
}
}
}
/* convert args array into a single string */
/* XXX - could change sync_pipe_add_arg() instead */
/* there is a drawback here: the length is internally limited to 1024 bytes */
for(i=0; argv[i] != 0; i++) {
if(i != 0) g_string_append_c(args, ' '); /* don't prepend a space before the path!!! */
quoted_arg = protect_arg(argv[i]);
g_string_append(args, quoted_arg);
g_free(quoted_arg);
}
/* call dumpcap */
if(!win32_create_process(argv[0], args->str, NULL, NULL, i_handles, handles,
CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi)) {
*msg = ws_strdup_printf("Couldn't run %s in child process: %s",
args->str, win32strerror(GetLastError()));
if (data_read_fd) {
ws_close(*data_read_fd); /* Should close data_pipe[PIPE_READ] */
CloseHandle(data_pipe[PIPE_WRITE]);
} else {
ws_close(signal_pipe_write_fd);
}
ws_close(message_read_fd); /* Should close sync_pipe[PIPE_READ] */
CloseHandle(sync_pipe[PIPE_WRITE]);
g_string_free(args, true);
g_free(handles);
return -1;
}
*fork_child = pi.hProcess;
/* We may need to store this and close it later */
CloseHandle(pi.hThread);
g_string_free(args, true);
g_free(handles);
if (signal_write_fd != NULL) {
*signal_write_fd = signal_pipe_write_fd;
}
#else /* _WIN32 */
/* Create a pipe for the child process to send us messages */
if (pipe(sync_pipe) < 0) {
/* Couldn't create the message pipe between parent and child. */
*msg = ws_strdup_printf("Couldn't create sync pipe: %s", g_strerror(errno));
return -1;
}
if (data_read_fd != NULL) {
/* Create a pipe for the child process to send us data */
if (pipe(data_pipe) < 0) {
/* Couldn't create the data pipe between parent and child. */
*msg = ws_strdup_printf("Couldn't create data pipe: %s", g_strerror(errno));
ws_close(sync_pipe[PIPE_READ]);
ws_close(sync_pipe[PIPE_WRITE]);
return -1;
}
}
if ((*fork_child = fork()) == 0) {
/*
* Child process - run dumpcap with the right arguments to make
* it just capture with the specified capture parameters
*/
if (data_read_fd != NULL) {
dup2(data_pipe[PIPE_WRITE], 1);
ws_close(data_pipe[PIPE_READ]);
ws_close(data_pipe[PIPE_WRITE]);
}
dup2(sync_pipe[PIPE_WRITE], 2);
ws_close(sync_pipe[PIPE_READ]);
ws_close(sync_pipe[PIPE_WRITE]);
execv(argv[0], argv);
sync_pipe_write_int_msg(2, SP_EXEC_FAILED, errno);
/* Exit with "_exit()", so that we don't close the connection
to the X server (and cause stuff buffered up by our parent but
not yet sent to be sent, as that stuff should only be sent by
our parent). We've sent an error message to the parent, so
we exit with an exit status of 1 (any exit status other than
0 or 1 will cause an additional message to report that exit
status, over and above the error message we sent to the parent). */
_exit(1);
}
if (fetch_dumpcap_pid && *fork_child > 0)
fetch_dumpcap_pid(*fork_child);
if (data_read_fd != NULL) {
*data_read_fd = data_pipe[PIPE_READ];
}
message_read_fd = sync_pipe[PIPE_READ];
#endif
/* Parent process - read messages from the child process over the
sync pipe. */
/* Close the write sides of the pipes, so that only the child has them
open, and thus they completely close, and thus return to us
an EOF indication, if the child closes them (either deliberately
or by exiting abnormally). */
#ifdef _WIN32
if (data_read_fd != NULL) {
CloseHandle(data_pipe[PIPE_WRITE]);
}
CloseHandle(sync_pipe[PIPE_WRITE]);
#else
if (data_read_fd != NULL) {
ws_close(data_pipe[PIPE_WRITE]);
}
ws_close(sync_pipe[PIPE_WRITE]);
#endif
if (*fork_child == WS_INVALID_PID) {
/* We couldn't even create the child process. */
*msg = ws_strdup_printf("Couldn't create child process: %s", g_strerror(errno));
if (data_read_fd != NULL) {
ws_close(*data_read_fd);
}
#ifdef _WIN32
if (signal_write_fd != NULL) {
ws_close(signal_pipe_write_fd);
}
#endif
ws_close(message_read_fd);
return -1;
}
#ifdef _WIN32
*message_read_io = g_io_channel_win32_new_fd(message_read_fd);
#else
*message_read_io = g_io_channel_unix_new(message_read_fd);
#endif
g_io_channel_set_encoding(*message_read_io, NULL, NULL);
g_io_channel_set_buffered(*message_read_io, false);
g_io_channel_set_close_on_unref(*message_read_io, true);
/* we might wait for a moment till child is ready, so update screen now */
if (update_cb) update_cb();
return 0;
}
/* a new capture run: start a new dumpcap task and hand over parameters through command line */
bool
sync_pipe_start(capture_options *capture_opts, GPtrArray *capture_comments,
capture_session *cap_session, info_data_t* cap_data,
void (*update_cb)(void))
{
#ifdef _WIN32
size_t i_handles = 0;
char control_id[ARGV_NUMBER_LEN];
#endif
GIOChannel *sync_pipe_read_io;
int argc;
char **argv;
int i;
unsigned j;
interface_options *interface_opts;
if (capture_opts->ifaces->len > 1)
capture_opts->use_pcapng = true;
ws_debug("sync_pipe_start");
capture_opts_log(LOG_DOMAIN_CAPTURE, LOG_LEVEL_DEBUG, capture_opts);
cap_session->fork_child = WS_INVALID_PID;
cap_session->capture_opts = capture_opts;
if (!extcap_init_interfaces(cap_session)) {
report_failure("Unable to init extcaps. (tmp fifo already exists?)");
return false;
}
argv = init_pipe_args(&argc);
if (!argv) {
/* We don't know where to find dumpcap. */
report_failure("We don't know where to find dumpcap.");
return false;
}
if (capture_opts->ifaces->len > 1)
argv = sync_pipe_add_arg(argv, &argc, "-t");
if (capture_opts->use_pcapng)
argv = sync_pipe_add_arg(argv, &argc, "-n");
else
argv = sync_pipe_add_arg(argv, &argc, "-P");
if (capture_comments != NULL) {
for (j = 0; j < capture_comments->len; j++) {
argv = sync_pipe_add_arg(argv, &argc, "--capture-comment");
argv = sync_pipe_add_arg(argv, &argc, (char*)g_ptr_array_index(capture_comments, j));
}
}
if (capture_opts->temp_dir) {
argv = sync_pipe_add_arg(argv, &argc, "--temp-dir");
argv = sync_pipe_add_arg(argv, &argc, capture_opts->temp_dir);
}
if (capture_opts->multi_files_on) {
if (capture_opts->has_autostop_filesize) {
char sfilesize[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-b");
snprintf(sfilesize, ARGV_NUMBER_LEN, "filesize:%u",capture_opts->autostop_filesize);
argv = sync_pipe_add_arg(argv, &argc, sfilesize);
}
if (capture_opts->has_file_duration) {
char sfile_duration[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-b");
snprintf(sfile_duration, ARGV_NUMBER_LEN, "duration:%f",capture_opts->file_duration);
argv = sync_pipe_add_arg(argv, &argc, sfile_duration);
}
if (capture_opts->has_file_interval) {
char sfile_interval[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-b");
snprintf(sfile_interval, ARGV_NUMBER_LEN, "interval:%d",capture_opts->file_interval);
argv = sync_pipe_add_arg(argv, &argc, sfile_interval);
}
if (capture_opts->has_file_packets) {
char sfile_packets[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-b");
snprintf(sfile_packets, ARGV_NUMBER_LEN, "packets:%d",capture_opts->file_packets);
argv = sync_pipe_add_arg(argv, &argc, sfile_packets);
}
if (capture_opts->has_ring_num_files) {
char sring_num_files[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-b");
snprintf(sring_num_files, ARGV_NUMBER_LEN, "files:%d",capture_opts->ring_num_files);
argv = sync_pipe_add_arg(argv, &argc, sring_num_files);
}
if (capture_opts->print_file_names) {
char *print_name = g_strdup_printf("printname:%s", capture_opts->print_name_to);
argv = sync_pipe_add_arg(argv, &argc, "-b");
argv = sync_pipe_add_arg(argv, &argc, print_name);
g_free(print_name);
}
if (capture_opts->has_nametimenum) {
char nametimenum[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-b");
snprintf(nametimenum, ARGV_NUMBER_LEN, "nametimenum:2");
argv = sync_pipe_add_arg(argv, &argc, nametimenum);
}
if (capture_opts->has_autostop_files) {
char sautostop_files[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-a");
snprintf(sautostop_files, ARGV_NUMBER_LEN, "files:%d",capture_opts->autostop_files);
argv = sync_pipe_add_arg(argv, &argc, sautostop_files);
}
} else {
if (capture_opts->has_autostop_filesize) {
char sautostop_filesize[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-a");
snprintf(sautostop_filesize, ARGV_NUMBER_LEN, "filesize:%u",capture_opts->autostop_filesize);
argv = sync_pipe_add_arg(argv, &argc, sautostop_filesize);
}
}
if (capture_opts->has_autostop_packets) {
char scount[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-c");
snprintf(scount, ARGV_NUMBER_LEN, "%d",capture_opts->autostop_packets);
argv = sync_pipe_add_arg(argv, &argc, scount);
}
if (capture_opts->has_autostop_duration) {
char sautostop_duration[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-a");
snprintf(sautostop_duration, ARGV_NUMBER_LEN, "duration:%f",capture_opts->autostop_duration);
argv = sync_pipe_add_arg(argv, &argc, sautostop_duration);
}
if (capture_opts->has_autostop_written_packets) {
char scount[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-a");
snprintf(scount, ARGV_NUMBER_LEN, "packets:%d",capture_opts->autostop_written_packets);
argv = sync_pipe_add_arg(argv, &argc, scount);
}
if (capture_opts->group_read_access) {
argv = sync_pipe_add_arg(argv, &argc, "-g");
}
if (capture_opts->update_interval != DEFAULT_UPDATE_INTERVAL) {
char scount[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "--update-interval");
snprintf(scount, ARGV_NUMBER_LEN, "%d", capture_opts->update_interval);
argv = sync_pipe_add_arg(argv, &argc, scount);
}
for (j = 0; j < capture_opts->ifaces->len; j++) {
interface_opts = &g_array_index(capture_opts->ifaces, interface_options, j);
argv = sync_pipe_add_arg(argv, &argc, "-i");
if (interface_opts->extcap_fifo != NULL)
{
#ifdef _WIN32
char *pipe = ws_strdup_printf("%s%" PRIuMAX, EXTCAP_PIPE_PREFIX, (uintmax_t)interface_opts->extcap_pipe_h);
argv = sync_pipe_add_arg(argv, &argc, pipe);
g_free(pipe);
i_handles++;
#else
argv = sync_pipe_add_arg(argv, &argc, interface_opts->extcap_fifo);
#endif
/* Add a name for the interface, to put into an IDB. */
argv = sync_pipe_add_arg(argv, &argc, "--ifname");
argv = sync_pipe_add_arg(argv, &argc, interface_opts->name);
if (interface_opts->descr != NULL)
{
/* Add a description for the interface, to put into an IDB. */
argv = sync_pipe_add_arg(argv, &argc, "--ifdescr");
argv = sync_pipe_add_arg(argv, &argc, interface_opts->descr);
}
}
else
argv = sync_pipe_add_arg(argv, &argc, interface_opts->name);
if (interface_opts->cfilter != NULL && strlen(interface_opts->cfilter) != 0) {
argv = sync_pipe_add_arg(argv, &argc, "-f");
argv = sync_pipe_add_arg(argv, &argc, interface_opts->cfilter);
}
if (interface_opts->has_snaplen) {
char ssnap[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-s");
snprintf(ssnap, ARGV_NUMBER_LEN, "%d", interface_opts->snaplen);
argv = sync_pipe_add_arg(argv, &argc, ssnap);
}
if (interface_opts->linktype != -1) {
const char *linktype = linktype_val_to_name(interface_opts->linktype);
if ( linktype != NULL )
{
argv = sync_pipe_add_arg(argv, &argc, "-y");
argv = sync_pipe_add_arg(argv, &argc, linktype);
}
}
if (!interface_opts->promisc_mode) {
argv = sync_pipe_add_arg(argv, &argc, "-p");
}
#ifdef CAN_SET_CAPTURE_BUFFER_SIZE
if (interface_opts->buffer_size != DEFAULT_CAPTURE_BUFFER_SIZE) {
char buffer_size[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-B");
if(interface_opts->buffer_size == 0x00)
interface_opts->buffer_size = DEFAULT_CAPTURE_BUFFER_SIZE;
snprintf(buffer_size, ARGV_NUMBER_LEN, "%d", interface_opts->buffer_size);
argv = sync_pipe_add_arg(argv, &argc, buffer_size);
}
#endif
#ifdef HAVE_PCAP_CREATE
if (interface_opts->monitor_mode) {
argv = sync_pipe_add_arg(argv, &argc, "-I");
}
#endif
#ifdef HAVE_PCAP_REMOTE
if (interface_opts->datatx_udp)
argv = sync_pipe_add_arg(argv, &argc, "-u");
if (!interface_opts->nocap_rpcap)
argv = sync_pipe_add_arg(argv, &argc, "-r");
if (interface_opts->auth_type == CAPTURE_AUTH_PWD) {
char sauth[256];
argv = sync_pipe_add_arg(argv, &argc, "-A");
snprintf(sauth, sizeof(sauth), "%s:%s",
interface_opts->auth_username,
interface_opts->auth_password);
argv = sync_pipe_add_arg(argv, &argc, sauth);
}
#endif
#ifdef HAVE_PCAP_SETSAMPLING
if (interface_opts->sampling_method != CAPTURE_SAMP_NONE) {
char ssampling[ARGV_NUMBER_LEN];
argv = sync_pipe_add_arg(argv, &argc, "-m");
snprintf(ssampling, ARGV_NUMBER_LEN, "%s:%d",
interface_opts->sampling_method == CAPTURE_SAMP_BY_COUNT ? "count" :
interface_opts->sampling_method == CAPTURE_SAMP_BY_TIMER ? "timer" :
"undef",
interface_opts->sampling_param);
argv = sync_pipe_add_arg(argv, &argc, ssampling);
}
#endif
if (interface_opts->timestamp_type) {
argv = sync_pipe_add_arg(argv, &argc, "--time-stamp-type");
argv = sync_pipe_add_arg(argv, &argc, interface_opts->timestamp_type);
}
}
/* dumpcap should be running in capture child mode (hidden feature) */
#ifndef DEBUG_CHILD
argv = sync_pipe_add_arg(argv, &argc, "-Z");
#ifdef _WIN32
snprintf(control_id, ARGV_NUMBER_LEN, "%ld", GetCurrentProcessId());
argv = sync_pipe_add_arg(argv, &argc, control_id);
#else
argv = sync_pipe_add_arg(argv, &argc, SIGNAL_PIPE_CTRL_ID_NONE);
#endif
#endif
if (capture_opts->save_file) {
argv = sync_pipe_add_arg(argv, &argc, "-w");
argv = sync_pipe_add_arg(argv, &argc, capture_opts->save_file);
}
for (i = 0; i < argc; i++) {
ws_debug("argv[%d]: %s", i, argv[i]);
}
if (capture_opts->compress_type) {
argv = sync_pipe_add_arg(argv, &argc, "--compress-type");
argv = sync_pipe_add_arg(argv, &argc, capture_opts->compress_type);
}
int ret;
char* msg;
#ifdef _WIN32
ret = sync_pipe_open_command(argv, NULL, &sync_pipe_read_io, &cap_session->signal_pipe_write_fd,
&cap_session->fork_child, capture_opts->ifaces, &msg, update_cb);
#else
ret = sync_pipe_open_command(argv, NULL, &sync_pipe_read_io, NULL,
&cap_session->fork_child, NULL, &msg, update_cb);
#endif
if (ret == -1) {
report_failure("%s", msg);
g_free(msg);
free_argv(argv, argc);
return false;
}
/* Parent process - read messages from the child process over the
sync pipe. */
free_argv(argv, argc);
cap_session->fork_child_status = 0;
cap_session->cap_data_info = cap_data;
/* We were able to set up to read the capture file;
arrange that our callback be called whenever it's possible
to read from the sync pipe, so that it's called when
the child process wants to tell us something. */
/* we have a running capture, now wait for the real capture filename */
if (cap_session->pipe_input_id) {
g_source_remove(cap_session->pipe_input_id);
cap_session->pipe_input_id = 0;
}
cap_session->pipe_input_id = g_io_add_watch(sync_pipe_read_io, G_IO_IN | G_IO_HUP, pipe_io_cb, cap_session);
/* Pipe will be closed when watch is removed */
g_io_channel_unref(sync_pipe_read_io);
return true;
}
/*
* Close the pipes we're using to read from dumpcap, and wait for it
* to exit. On success, *msgp is unchanged, and the exit status of
* dumpcap is returned. On failure (which includes "dumpcap exited
* due to being killed by a signal or an exception"), *msgp points
* to an error message for the failure, and -1 is returned. In the
* latter case, *msgp must be freed with g_free().
*/
static int
sync_pipe_close_command(int *data_read_fd, GIOChannel *message_read_io,
ws_process_id *fork_child, char **msgp)
{
ws_close(*data_read_fd);
if (message_read_io != NULL)
g_io_channel_unref(message_read_io);
#ifdef _WIN32
/* XXX - Should we signal the child somehow? */
sync_pipe_kill(*fork_child);
#endif
return sync_pipe_wait_for_child(*fork_child, msgp);
}
/*
* Run dumpcap with the supplied arguments.
*
* On success, *data points to a buffer containing the dumpcap output,
* *primary_msg and *secondary_message are NULL, and 0 is returned; *data
* must be freed with g_free().
*
* On failure, *data is NULL, *primary_msg points to an error message,
* *secondary_msg either points to an additional error message or is
* NULL, and -1 is returned; *primary_msg, and *secondary_msg if not NULL,
* must be freed with g_free().
*/
/* XXX - assumes PIPE_BUF_SIZE > SP_MAX_MSG_LEN */
#define PIPE_BUF_SIZE 5120
static int
sync_pipe_run_command_actual(char* const argv[], char **data, char **primary_msg,
char **secondary_msg, void(*update_cb)(void))
{
char *msg;
int data_pipe_read_fd, ret;
GIOChannel *sync_pipe_read_io;
ws_process_id fork_child;
char *wait_msg;
char buffer[PIPE_BUF_SIZE+1] = {0};
ssize_t nread;
char indicator;
int32_t exec_errno = 0;
int primary_msg_len;
char *primary_msg_text;
int secondary_msg_len;
char *secondary_msg_text;
char *combined_msg;
GString *data_buf = NULL;
ssize_t count;
ret = sync_pipe_open_command(argv, &data_pipe_read_fd, &sync_pipe_read_io, NULL,
&fork_child, NULL, &msg, update_cb);
if (ret == -1) {
*primary_msg = msg;
*secondary_msg = NULL;
*data = NULL;
return -1;
}
/*
* We were able to set up to read dumpcap's output. Do so.
*
* First, wait for an SP_ERROR_MSG message or SP_SUCCESS message.
*/
nread = pipe_read_block(sync_pipe_read_io, &indicator, SP_MAX_MSG_LEN,